Mask

Abstract

A mask includes a main body, mask cord and cord lock. The cord lock is made of an elastic material and movably attached to the mask cord for adjusting a circle contour formed by the main body, mask cord and cord lock for putting around a user's head. The cord lock includes a locking portion connected to a grip portion that internally defines a receiving space and the grip portion is divided into a deformable zone and a supporting zone. A smaller circle contour is adjustable to a larger one through deformation of the deformable zone, which allows the cord lock to move closer to the head and release some length of the mask cord that is originally received in the receiving space for expanding the circle contour. Meanwhile, the cord lock and the mask cord do not slide relative to each other and the mask maintains secure seal.

What is claimed is: 
     
         1 . A mask, comprising:
 a main body;   a mask cord connected to the main body; and   a cord lock attached to the mask cord; the cord lock and the mask cord together with the main body forming a circle contour for putting on a user's head to fix the main body to the user's face; and the cord lock being made of an elastic material to be movable relatively with the mask cord; and the cord lock including:   a locking portion provided with a bore extended in a cord insertion direction; and   the bore being elastically expandable by the mask cord, so that the mask cord is clamped by the locking portion; and a grip portion having an annular wall connected to the locking portion; the annular wall internally defining a receiving space communicable with the bore of the locking portion; and the mask cord having a confined section including two bilaterally symmetrical parts being received in the bore and the receiving space;   the annular wall of the grip portion including a deformable zone and a supporting zone having a wall thickness larger than the wall thickness of the deformable zone;   the locking portion, the deformable zone and the supporting zone are arranged in a straight line from bottom to top without overlapping one another in an initial state;   the deformable zone being bendable to form a first bent part and a second bent part when the cord lock is subjected to a force from a direction parallel to the cord insertion direction; and the deformable zone is caused to overlap the locking portion, such that the cord lock is changed from the initial state into a invagination state; and   wherein when the cord lock is changed from the initial state into the invagination state, or changed from the invagination state into the initial state, a size of the circle contour is changed accordingly.   
     
     
         2 . The mask as claimed in  claim 1 , wherein the receiving space has a cross-sectional area smaller than or equal to the cross-sectional of the locking portion when the cord lock is in the initial state; and the cross-sectional area of the receiving space being changed to an expanded cross-sectional area when the cord lock is in the invagination state and the deformable zone is subjected to push by the locking portion to deform. 
     
     
         3 . The mask as claimed in  claim 1 , wherein the receiving space has a cross-sectional area larger than that of the locking portion when the cord lock is in the initial state; such that when the cord lock is changed into the invagination state, the first bent part, the second bent part and the locking portion directly enter into the receiving space without changing the cross-sectional area of the receiving space and the deformable zone is elongated when the supporting zone and the locking portion move closer to each other. 
     
     
         4 . The mask as claimed in  claim 1 , wherein the deformable zone has an outer side forming a conical surface, the supporting zone has an outer side forming a round surface, and an inner wall surface of the deformable zone and an inner wall surface of the supporting zone together define a cylindrical inner surface; the locking portion being located adjacent to an end of the cylindrical inner surface, and the second bent part being located at an end of the conical surface to be adjacent to the round surface. 
     
     
         5 . The mask as claimed in  claim 1 , wherein the cord lock is movable relatively with the mask cord in the cord insertion direction when the cord lock is changed from the initial state into the invagination state; and wherein the cord lock is movable relatively with the mask cord in a direction opposite to the cord insertion direction when the cord lock maintains the initial state. 
     
     
         6 . The mask as claimed in  claim 1 , wherein the cord lock further includes an abutting portion located at an end of the grip portion opposite to the locking portion and being formed with an annular flange, the abutting portion has an outer periphery larger than that of the grip portion; the annular flange having an inner peripheral edge located adjacent to the receiving space and formed into a rounded angle, and defining a flat annular surface located perpendicular to the cord insertion direction and having an area larger than the cross-sectional area of the receiving space. 
     
     
         7 . The mask as claimed in  claim 1 , wherein the mask cord is made of an elastic material and can generate a first deformation amount when being pulled; the cord lock can be moved relative to the mask cord to generate an amount of movement and the cord lock is compressible to generate a second deformation amount; and
 the size of the circle contour is adjustable through any one of the amount of movement, the first deformation amount and the second deformation amount.   
     
     
         8 . The mask as claimed in  claim 7 , wherein the circle contour has a first size determined by adjusting the amount of movement, and the first size of the circle contour being changeable to a second size larger than the first size through at least one of the first deformation amount and the second deformation amount. 
     
     
         9 . The mask as claimed in  claim 1 , when two forces are respectively applied to the bilaterally symmetrical parts of the confined section in different direction, the locking portion can being deformed by the bilaterally symmetrical parts; a first end of the bore located adjacent to the receiving space is expanded when the bilaterally symmetrical parts are separated to each other, and a second end of the bore far away from the receiving space is narrowed by deformation of the locking portion.